Question

hey! guyz

plzz solve this by step by step explanation​

Answer 1

Step-by-step explanation:

-47=18 + (n-1) 2.5

solve the equation for n

and the value of n will be the answer.

please Mark brainliest if you find it useful.

Answer 2

SOLUTION:

GIVEN THE SERIES IS IN ARITHMETIC PROGRESSION .

IN ARITHMETIC PROGRESSION LAST TERM = a + (n-1)d

WHERE a IS FIRST TERM , n IS NUMBER OF TERMS , d IS COMMON DIFFERENCE

IN THE GIVEN SERIES ,

FIRST TERM (a) = 18

COMMON DIFFERENCE(d) = a2 - a1 = (31/2) - (18) = -5/2

LAST TERM = -47

$= > a + (n - 1)d = - 47 \\ \\ = > 18 + (n - 1)( - \frac{5}{2}) = - 47 \\ \\ = > (n - 1)( - \frac{5}{2} ) = - 65 \\ \\ = > (n - 1) = \frac{ - 65 \times 2}{ - 5} \\ \\ = > (n - 1) = 26 \\ \\ = > n = 27$

∴ NUMBER OF TERMS = 27

HOPE IT HELPS !!!!