1.

Find the sum 34+32+30+...+10Formula:an=a+(n-1)d

Answer»

Step-by-step explanation:

10=34+ (N-1) (-2)

10-34 = -2n + 2

-14 - 2 = -2n

-16

----- =n

-2

So n is 8

SN = n/2 (a + an)

= 4 (32 + 10)

= 4 (42)

168

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