Question

15. The first second and last terms of an AP are respectively 4, 7 and 31. How many terms are there
in the given AP?
(1) 10 (6) 12 (c)8 (1) 13​

Answer 1

Answer:

10 terms

Step-by-step explanation:

• a+(n-1)d=31
• 4+(n-1)3=31
• 4+3n-3=31
• 3n=31-1
• 3n=30
• n=10

Answer 2

Answer:

option 1 is the correct

Step-by-step explanation:

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