SHORTCUTS OF QUANTITATIVE APTITUDE FOR SSC CGL

IF SAME NUMBER IS THERE IN A SERIES LIKE 88888 OR 9999 UP TO AS MUCH AS YOU CAN....
IF YOU WANT TO FIND THEIR SUM

LETS TAKE AN EXAMPLE

8888+888+88+8=?

WE START FROM THE LEFT MULTIPLY 8 BY 1, 2, 3 & 4.

U WILL GET YOUR ANSWER

THOSE NUMBER WHOSE ALL DIGITS ARE 9

 (99)^2=9801

(999)^2=998001

(9999)^2=99980001

(99999)^2=9999800001

THOSE NUMBER WHOSE ALL DIGITS ARE 3

(33)^2=1089                  

THOSE NUMBER IN WHICH ALL DIGITS ARE NUMBER IS 3 TWO OR MORE THAN 2 TIMES REPEATED, TO FIND THE SQUARE OF THESE NUMBER,WE REPEAT 1 AND 8 BY (n-1). WHERE n= NUMBER OF TIMES 3 IS REPEATED

(333)^2=110889

(3333)^2=11108889

TO CHECK 401 IS A PRIME NUMBER

 APPROXIMATE SQUARE ROOT = 20

PRIME NO < 20 ARE 2, 3, 5, 7, 11, 13, 17, 19

401 IS NOT DIVISIBLE BY ANY OF THESE PRIME NUMBERS

SO 401 IS A PRIME NUMBER.

Comments

  1. PLACEMENT TRAINING22 January 2021 at 03:47

    Hi, Thanks for sharing. Very informative post, that I have ever read, the strategy given is really very helpful....Here I’m giving best SI ONLINE TRAINING details, once go through it.
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    ReplyDelete

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