Question

Without adding,find the sum
a. 1+3+5+7=
b. 1+3+5+7+9+11+13+15+17+19+21+23+25+27+29=
c. express 49as the sum of 7 odd numbers​

Answer 1

Answer:

a.16

b.225

c.1+3+5+7+9+11+13

a. there are 4 numbers so we shld find square of 4

b.15 numbers are there so square of 15 is 225

c.49 is the square of 7, so 7 odd numbers should be added

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