Math, asked by risha111222, 1 year ago

WITHOUT DOING ACTUAL CALCULATION, FIND THE SUM.
a)1+3+5+7+9+____+39+41

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Answers

Answered by TooFree

STEP 1: Find the difference:

d = 3 - 1

d = 2

..................................................................................................

STEP 2: Total number of terms:

an = a1 + (n - 1)d

41 = 1 + (n - 1) (2)

41 = 1 + 2n - 2

2n = 41

n = 21

...................................................................................................

STEP 3: Find the sum:

Sn = n/2 (a1 + an)

Sn = 21/2 (1 + 41)

Sn = 441

...................................................................................................

Answer : The sum of the series is 441.

risha111222: which country

TooFree: hahaha .. math is an international language :)

risha111222: Am asking from which country do you belong.

ycjcjvkbjcgzjvlfjd: Hi

ycjcjvkbjcgzjvlfjd: Hey Risha am not getting the answer

Answered by Shailesh183816

I hope it help you
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