Question

Find the sum of indicated number of terms in each of the following A.P.,s 1)16,11,6......,23 TERMS

Answer 1

-897 is ans may this will help u

Answer 2

▬▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬▬

❥ Given :-

AP = 16 , 11 , 6 , . . . . . . 23 terms

⚡ $\bf{a}_{1}$ = 16

⚡ $\bf{a}_{2}$ = 11

⚡ $\bf{a}_{3}$ = 6

⚡ $\bf{n}$ = 23

❤ Common difference = $\bf{a}_{2} \: {-} \: \bf{a}_{1}$ = 11 - 16 → -5

⛄ $\huge{S}_{n}$ = $\frac{n}{2}$ [ 2a + ( n - 1 ) d ]

• $\frac{ 23 }{ 2 }$ [ 2 × 16 + 22 × -5 ]
• 11 × 5 [ 32 - 120 ]
• 11 × 5 ( -78 )
• 55 × ( -78 )
• -897

⛄ $\huge{S}_{n} \: {=} \: {-897}$

▬▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬▬