Question

without adding,find the sum?(a)1+3+5+7+9,(a)1+3+5+7+9+11+13
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Answer 1

Answer:

hey mate here is your answer

Step-by-step explanation:

sum of consicutive odd numbers

= n² where n = number of terms

so 1+3+5+7+9 has 5 terms

so sum is 5² = 25

1+3+5+7+9+11+13 , has 7 terms

sum = 7² = 49

Answer 2

Answer:

a) 25

b) 49

Step-by-step explanation:

According to AP formula,

Sum of odd numbers = n^2

where n is number of terms

a) 1+3+5+7+9 = 5^2 = 25

b) 1+3+5+7+9+11+13 = 7^2 = 49