Answers

2014-10-02T22:29:37+05:30
(70-1)²
4900-140+1
4761.
0
2014-10-02T22:39:58+05:30

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69 = (70-1)
69² = (70-1)²
=70² - 2×70×1 + 1²    [(a-b)² = a² - 2ab + b²]
=4900 -140 +1
=4761
0
Dear TPS, What is your real name? Can you tell me?
It's Tarun bro.
I can't call you bro cuz I've only one and unique bro in the world so Sorry!
No problem.