the 20th term of the arithmetic progression 10,7,4,........ is
option provided
a)-57
b)47
c)-47
d)67
when I sloved i got the answer as 67 but the answer is -47
please slove step by step
I have my board exma on Monday so please help as early as possible
Answers
Answered by
1
a =10 and d =-3
an= a+(n-1)d
an= 10 +(20-1)(-3)
an= 10-19(3)
an= 10-57
an = -47
an= a20
which is 20th term
an= a+(n-1)d
an= 10 +(20-1)(-3)
an= 10-19(3)
an= 10-57
an = -47
an= a20
which is 20th term
amitkhokhar:
i think had taken common difference as +3 but its -3
THE COMMON DIFFERENCE IS -3 AS THE COMMON DIFFERENCE IS CALCULATED ON THE BASIS OF 2ND NO.-1ST NO. OF THE PROGRESSION..AND THAT'S HOW BOTH OF US LANDED WITH-47 BUT IF WE HAD TAKEN D=3 WE WOULD HAVE GOT ANS. AS 67 AS WELL
Answered by
1
Answer:
-47
Step-by-step explanation:
A=10
D=7-10=-3
T20=10+19*-3
T20=10-57
T20=-47
THE ANSWER WILL COME IN NEGATIVE AS THE DIFFERENCE OF THE PROGRESSION IS NEGATIVE.
ALWAYS TAKE NOTE OF THE DIFFERENCE WHEN SOLVING AP SUMS
ALL THE BEST...
HE COMMON DIFFERENCE IS -3 AS THE COMMON DIFFERENCE IS CALCULATED ON THE BASIS OF 2ND NO.-1ST NO. OF THE PROGRESSION.
THE
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