Question

5+7+9+11+.......(50 terms)=________​

Answer 1

ANSWER:

SUM OF 50 TERMS = 2700

GIVEN:

a = 5

d = second term - first term

d = 7 - 5 = 2

n = 50

TO FIND:

Sum of 50 terms.

FORMULA:

This is an Arithmetic Progression

$S_n$ = n/2 (2a + (n - 1)d )

EXPLANATION:

$S_{50}$ = 50/2 (2(5) + (50 - 1)2 )

$S_{50}$ = 25 (10 + (49)2 )

$S_{50}$ = 25 (10 + 98)

$S_{50}$ = 25 (108)

$S_{50}$ = 2700

SUM OF 50 TERMS = 2700

Answer 2

Answer:

$5 + 7 + 9 + 11 = 32 \\ \\ 32 \times 50 = 1600$

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